How to watch Youtube videos (Including HD) without flash in Firefox
First you need to install Greasemonkey extension for Firefox and install this Greasemonkey script after completion you need to restart your firefox.
We are installed script called Youtube without Flash Auto Adds links below the Youtube video to (a) download the video (HD .mp4 file, no converters are used, no external sites) (b) view the video with an embedded external player (like mplayerplug-in or the totem plugin)
This script offers direct access to Youtube videos, that is, the high quality .mp4 or .flv files. It doesn't use any external sites or converters like some other scripts. The script adds links below the Youtube video to
* download the video * replace the Flash player by an embedded external player.
(On Ubuntu, the default embedded player is the totem plugin, but you can also install mplayerplug-in or any other plugin that can play .flv and .mp4 videos.)
The script should work with Firefox, Safari, Opera, Epiphany and Google Chrome.